the values are based on lvl 70. and they are usefull for endgame content. (vs lvl 73 mobs and bosses).
it gives an optimal balance between add-damage and all other stats.
read this thread to get the full math behind the values.

these values are based on lvl 70. they calculates ONLY the potential of frostdamage vs lvl 73 mobs.
its not spelldam, its directly calculated to frostbolt-damage. (including talents and all adddam-coefficients)